1 + 2, Alan Wilder's first solo release away from Depeche Mode, is a Recoil studio EP, released in August 1986. The CD and cassette version were released two years later with Recoil's second release, Hydrology.

A 1-2 (pronounced "one, two") is a difficult gymnastics floor move. The name is derived from the fact that the move consists of a single twist followed by a double twist on both the horizontal and vertical axes. Although this move is most commonly seen in running tumbling (gymnastics), it can be done from a standing start.

In mathematics, certain kinds of mistaken proof are often exhibited, and sometimes collected, as illustrations of a concept of mathematical fallacy. There is a distinction between a simple mistake and a mathematical fallacy in a proof: a mistake in a proof leads to an invalid proof just in the same way, but in the best-known examples of mathematical fallacies, there is some concealment in the presentation of the proof. For example the reason validity fails may be a division by zero that is hidden by algebraic notation. There is a striking quality of the mathematical fallacy: as typically presented, it leads not only to an absurd result, but does so in a crafty or clever way. Therefore these fallacies, for pedagogic reasons, usually take the form of spurious proofs of obvious contradictions. Although the proofs are flawed, the errors, usually by design, are comparatively subtle, or designed to show that certain steps are conditional, and should not be applied in the cases that are the exceptions to the rules.

The Union Cycliste Internationale (UCI), the world's governing body in the sport of bicycle racing, classifies races according to a rating scale.